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Design of a ball screw for space applications
Volf, Tadeáš ; Pouzar, Josef (referee) ; Košťál, David (advisor)
This work deals with the construction of a ball screw acting as part of the table feed mechanism within a vacuum tribometer of the "pin on plate" type. The working environment inside the tribometer simulates real conditions of the space environment such as vacuum and high temperature differences. Therefore, the construction of the ball screw must primarily respect the parameters of the operating environment and further dimensional compatibility with the tribometer assembly. The resulting construction of this mechanism will be based on critical research of existing solutions and procedures, conceptual designs of specific solutions, as well as calculations and selection of standardized construction parameters and parameters affecting the impacts of the operating environment. Based on these calculations, resulting contact pressures and deformations between rolling elements and their tracks caused by thermal expansion were determined. These calculations are primarily based on Hertz's theory of contact pressures. Subsequently, their verification against their permissible values was carried out. The output of this work is a satisfactory design solution of the ball screw and corresponding drawing documentation.
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SW/HW toolset for board-level tests
Ostřížek, Tomáš ; Pavlík, Michal (referee) ; Bohrn, Marek (advisor)
This thesis describes the design of a board-level testing platform for monitoring and driving a selected set of interfaces used in space applications. The requirements of these devices are based on the corresponding ECSS, IEEE, and TIA standards described in the theoretical part of this thesis. The designed testing device is controlled by the Xilinx Zynq-7000 system-on-chip and is connected to a control PC via an Ethernet connection. The hardware, designed on a schematic level is responsible for meeting the standards' requirements. The software part consists of a Python module for the control PC providing a set of functions to be used in the testing process and a C application for the embedded ARM processor that forwards the data through the AXI interface to the interface drivers in the programmable logic.
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Analysis of critical parameters of the batteries for space applications
Šimek, Michal ; Šedina, Martin (referee) ; Kazda, Tomáš (advisor)
This thesis deals with the use of lithium-ion batteries for space applications. Primary and secondary electrochemical sources and their comparison are described in the paper. The main part of this work deals with lithium-ion batteries, their history, properties and used materials, deals with the use of li-ion batteries for space applications in terms of temperature and describes the effects of temperatures on li-ion batteries. At the last chapter deals with a lithium plating and his detection. In the practical part, a methodology for the detection of cast plating is proposed, which I then test on a number of cells, which I measure at various practical workloads.
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Analysis of critical parameters of the batteries for space applications
Šimek, Michal ; Šedina, Martin (referee) ; Kazda, Tomáš (advisor)
This thesis deals with the use of lithium-ion batteries for space applications. Primary and secondary electrochemical sources and their comparison are described in the paper. The main part of this work deals with lithium-ion batteries, their history, properties and used materials, deals with the use of li-ion batteries for space applications in terms of temperature and describes the effects of temperatures on li-ion batteries. At the last chapter deals with a lithium plating and his detection. In the practical part, a methodology for the detection of cast plating is proposed, which I then test on a number of cells, which I measure at various practical workloads.
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SW/HW toolset for board-level tests
Ostřížek, Tomáš ; Pavlík, Michal (referee) ; Bohrn, Marek (advisor)
This thesis describes the design of a board-level testing platform for monitoring and driving a selected set of interfaces used in space applications. The requirements of these devices are based on the corresponding ECSS, IEEE, and TIA standards described in the theoretical part of this thesis. The designed testing device is controlled by the Xilinx Zynq-7000 system-on-chip and is connected to a control PC via an Ethernet connection. The hardware, designed on a schematic level is responsible for meeting the standards' requirements. The software part consists of a Python module for the control PC providing a set of functions to be used in the testing process and a C application for the embedded ARM processor that forwards the data through the AXI interface to the interface drivers in the programmable logic.
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